Orlymanite Mineral Data

Orlymanite Mineral Data +

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General Orlymanite Information

Chemical Formula:

Ca4Mn++3Si8O20(OH)6·2(H2O)

Composition:

Molecular Weight = 1,007.87 gm

Calcium 15.91 % Ca 22.26 % CaO

Manganese 16.35 % Mn 21.11 % MnO

Silicon 22.29 % Si 47.69 % SiO₂

Hydrogen 1.00 % H 8.94 % H₂O

Oxygen 44.45 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Mn²⁺₃Si₈O₂₀(OH)₆·2(H₂O)

Environment:

Part of a vein assemblage. One specimen known.

IMA Status:

Approved IMA 1990

Locality:

Wessels mine, Kalahari manganese field, Cape Province, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Orlando P. Lyman (1903-1986), founder of Lyman House Memorial Museum, Hilo, Hawaii.

Synonym:

IMA1988-029

Orlymanite Image

Images:

Orlymanite

Comments: Brown crystalline orlymanite with radiating structure, on inesite.
Location: N'Chwaning Mine, Kuruman, Northern Cape Province, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orlymanite Crystallography

Axial Ratios:

a:c = 1:3.74166

Cell Dimensions:

a = 9.6, c = 35.92, Z = 5; V = 2,866.88 Den(Calc)= 2.92

Crystal System:

TrigonalSpace Group: P 3-,P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.6(1), 1.84(0.9), 3.13(0.8),

Physical Properties of Orlymanite

Cleavage:

[0001] Perfect

Color:

Dark brown.

Density:

2.7 - 2.8, Average = 2.75

Diaphaniety:

Translucent

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Orlymanite

Dichroism (e):

dark brown.

Dichroism (w):

pale brown.

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.2175,KC= 0.2179

Optical Data:

Uniaxial (-), w=1.598.

Calculated Properties of Orlymanite

Electron Density:

r_electron=2.73 gm/cc
note: r_Orlymanite=2.75 gm/cc.

Fermion Index

Fermion Index = 0.01084
Boson Index = 0.98916

Photoelectric:

PE_Orlymanite= 6.91 barns/electron
U=PE_Orlymanite x r_electron= 18.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orlymanite is Not Radioactive

Orlymanite Classification

Dana Class:

73.2.2b.2 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.2)with double and single layers

(73.2.2b)Reyerite group (Minehillite Subgroup)

73.2.2b.1 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

73.2.2b.2 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

Strunz Class:

VIII/H.34-25 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.34 - Gyrolite series

VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1

VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2

Other Orlymanite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Orlymanite

Ca4Mn++3Si8O20(OH)6·2(H2O)
Dana No: 73.2.2b.2 Strunz No: VIII/H.34-25
Locality:

Notes: